Device for preventing cinder eruptions from blast furnaces



Sept. 20, 1949. H. G. HARD DEVICE FOR PREVENTING CINDER ERUPTIONS FROMBLAST FURNACES Filed March 50, 1948 FIG- lhveniam 19 595597 6, H495)Patented Sept. 20, 1949 DEVICE FOR PREVENTING CINDER EBUP- TIONS FROMBLAST FURNACES Wanna,

Birmingham Tennessee Coal, Iron and Company, a corporation of AlabamaApplication March 30, 1948, Serial No. 17,997

1 This invention relates to metallurgical blast furnaces andparticularly to improved means for preventing cinder eruptions fromblast furnace hearths.

In the usual blast furnace with which I am familar, the refractorybrickwork of the hearth is surrounded by an outer jacket of heavy steelplates and a water cooled jacket within the outer jacket. The upper edgeof the water cooled jacket has an outwardly directed ledge which restson the upper edge of the outer jacket and receives the cooling waterconnections. The tuyre jacket is supported on this ledge. The fitbetween the ledge and the tuyere jacket is often imperfect. Thus thereis a plane of weakness through the furnace wall through which moltencinder can erupt and cause severe damage.

An object of the present invention is to provide an improved and simpledevice for preventing cinder eruptions between the tuyre jacket and thewater cooled hearth jacket.

A further object of the invention is to provide a means which solidifiesany cinder that reaches the plane of contact between the tuyre jacketand the water cooled hearth jacket and thus utilizes such material toeffect a complete seal of the plane of weakness.

In accomplishing these and other objects of the invention, I haveprovided improved details of structure preferred forms of which areshown in the accompanying drawings in which:

Figure 1 is a vertical sectional view of a blast furnace equipped withan improved device embodying features of the present invention;

Figure 2 is an enlarged vertical sectional view of the device shown inFigure 1; and

The contact between ledge l6 and tuyre jacket I8 is likely to beimperfect since the contacting surfaces are not machined but remainsomewhat irregular. With usual constructions gases and cinder sometimesescape through brickwork l5 and may then erupt through the imperfectcontact and cause severe damage to the furnace. To prevent suchoccurrences in accordance with the present invention, a continuousannular flange depends from the underface 0f tuyere jacket l8. Saidflange is spaced inwardly from the edge of the tuyre jacket and fitsbetween the outside of the brickwork and the inside of the water cooledhearth jacket closely within the latter. Any

molten cinder that tends to escape from the hearth through the brickworkimpinges on the inner face of flange 2. and must flow around be neathsaid flange. Such cinder is thus brought into contact with water cooledjacket it below 20 the contact with the tuycre jacket. The water cooledjacket solidifies the cinder which thus furnishes a seal against furthercinder eruptions from the hearth.

In the construction shown in Figure 2 the 25.flange is welded to theunderface of the tuyere jacket. In the modified construction shown inFigure 3, the flange, designated 2|, is integral with the underface ofthe tuyere jacket, the con- Figures 3, 4 and 5 are enlarged verticalsecmay be of any usual construction. The furnace hearth is designated l2and comprises an outer jacket l3, 9. water cooled jacket l4 andbrickwork i5, all of circular outline in plan. As best shown in Figure2, the upper edge of the water cooled hearth jacket has a ledge itthrough which cooling water enters the jacket via connections l'l. Ledgeit rests on the upper edge of outer jacket I3 and supports the tuyerejacket It. The latter jacket has a somewhat smaller outside diameterthan the hearth jackets and its edge is spaced inwardly from the edge ofledge l6.

Tuyere jacket ll carries cooling plates IQ.

struction otherwise being the same as that shown in Figure 2. In themodified construction shown in Figure 4, the flange, designated 22, isintegral as in Figure 3 construction, but also contains a cooling waterduct 23 connected with the cooling water connection to the water cooledjacket.

In Figure 5 I have shown a modified construc. tion in which the tuyrejacket extends outwardly of the hearth jackets. In this construction theflange, designated 24, is secured to the inner face of the tuyere jacketand comprises a ring of right, angle cross section. The vertical leg ofthe flange fits closely within the water cooled jacket as before. It isseen that the operation of this construction is similar to that ofFigures 1 and 2.

While I have shown and described only certain illustrative embodimentsof the present invention, it is apparent that further modifications mayrise. Therefore, I do not wish to be limited by the disclosure but onlyby the scope of the appended claims.

I claim:

1. In a blast furnace wherein the tuyre jacket is supported on the watercooled jacket that surrounds the hearth, a device for preventing cindereruptions through the plane of contact between the jackets comprising anannular flange dev3 pending from the tuyere jacket and fitting withinthe water cooled jacket.

2. In a blast furnace having an outer jacket and a water cooled jacketsurrounding the brickwork of the hearth, an outwardly extending ledge onthe upper edge of said water cooled jacket resting on the upper edge ofsaid outer jacket, and a tuyere jacket resting on said ledge, a devicefor preventing cinder eruptions through the plane of contact between thejackets comprising an annular flange depending from the underface ofsaid tuyre jacket and fitting closely within said water cooled jacket.

3. In a blast furnace having an outer jacket and a water cooled jacketsurrounding the brickwork of the hearth, an outwardly extending ledge onthe upper edge of saidwater cooled jacket resting on the upper edge ofsaid outer jacket, and a tuyere jacket resting onsaid ledge, the contactbetween said ledge and said tuyre jacket being imperfect, a device forpreventing cinder eruptions through the imperfect contact comprising anannular metal flange depending from the underface of said tuyre jacketand fitting closely within said water cooled jacket, said flange forminga baiiie to deflect cinder that escapes through the brickwork intocontact with said water cooled jacket.

4. In a blast furnace having an outer jacket and a water cooled jacketsurrounding the brickwork of the hearth, an outwardly extending ledge onthe upper edge of said water cooled jacket resting on the upper edge ofsaid outer jacket and receiving the cooling water connections to saidwater cooled jacket, and a tuyre jacket resting on said ledge, thecontact between said ledge and said tuyre jacket being imperfect, adevice for preventing cinder eruptions through the imperfeet contactcomprising an annular flange depending from the underface of said tuyrejacket inwardly of the outer edge and fitting between the outside of thebrickwork and the inside of said water cooled jacket closely within thelatter, said flange forming a baiiile to deflect cinder that escapesthrough the brikwork into contact with said water cooled jacket beneaththe imperfect contact with the .tuyere jacket.

5. In a blast furnace having an outer jacket and a water cooled jacketsurrounding the brickwork of the hearth, an outwardly extending ledge onthe upper edge of said water cooled jacket resting on the upper edge ofsaid outer jacket and receiving the cooling water connections to saidwater cooled jacket, and a tuyre jacket resting on said ledge, thecontact between said ledge and said tuyere jacket being imperfect, adevice for preventing cinder eruptions through the imperfect contactcomprising an annular flange depending from the underface of said tuyerejacket inwardly of the outer edge and fitting between the outside of thebrickwork and the inside of said water cooled jacket, said flangecontaining a duct for circulation of cooling water connected with thecooling water connections to said water cooled jacket.

HERBERT G. HARD.

REFERENCES CITED The following references are of record in the file Ofthis patent:

UNITED STATES PATENIS Number Name Date 614,381 Gaines "Nov. 15, 1898OTHER REFERENCES Ser. No. 297,370, Bartscherer (A. P. C.), published May25, 1943.

